Computes corrected PDFs according to the Bodek-Yang model. More...

#include <BYPDF.h>

Inheritance diagram for genie::BYPDF:

Collaboration diagram for genie::BYPDF:

Public Member Functions
	BYPDF ()
	BYPDF (string config)
virtual	~BYPDF ()
double	UpValence (double x, double q2) const
	PDFModelI interface implementation.
double	DownValence (double x, double q2) const
double	UpSea (double x, double q2) const
double	DownSea (double x, double q2) const
double	Strange (double x, double q2) const
double	Charm (double x, double q2) const
double	Bottom (double x, double q2) const
double	Top (double x, double q2) const
double	Gluon (double x, double q2) const
PDF_t	AllPDFs (double x, double q2) const
void	Configure (const Registry &config)
void	Configure (string config)
Public Member Functions inherited from genie::PDFModelI
virtual	~PDFModelI ()
Public Member Functions inherited from genie::Algorithm
virtual	~Algorithm ()
virtual void	FindConfig (void)
virtual const Registry &	GetConfig (void) const
Registry *	GetOwnedConfig (void)
virtual const AlgId &	Id (void) const
	Get algorithm ID.
virtual AlgStatus_t	GetStatus (void) const
	Get algorithm status.
virtual bool	AllowReconfig (void) const
virtual AlgCmp_t	Compare (const Algorithm *alg) const
	Compare with input algorithm.
virtual void	SetId (const AlgId &id)
	Set algorithm ID.
virtual void	SetId (string name, string config)
const Algorithm *	SubAlg (const RgKey &registry_key) const
void	AdoptConfig (void)
void	AdoptSubstructure (void)
virtual void	Print (ostream &stream) const
	Print algorithm info.

Private Member Functions
void	LoadConfig (void)
double	DeltaDU (double x) const

Private Attributes
const PDFModelI *	fBasePDFModel
	configuration parameters
double	fX0
	correction param X0
double	fX1
	correction param X1
double	fX2
	correction param X2
double	fQ2min
	min. Q2 for PDF evaluation

Additional Inherited Members
Static Public Member Functions inherited from genie::Algorithm
static string	BuildParamVectKey (const std::string &comm_name, unsigned int i)
static string	BuildParamVectSizeKey (const std::string &comm_name)
static string	BuildParamMatKey (const std::string &comm_name, unsigned int i, unsigned int j)
static string	BuildParamMatRowSizeKey (const std::string &comm_name)
static string	BuildParamMatColSizeKey (const std::string &comm_name)
Protected Member Functions inherited from genie::PDFModelI
	PDFModelI ()
	PDFModelI (string name)
	PDFModelI (string name, string config)
Protected Member Functions inherited from genie::Algorithm
	Algorithm ()
	Algorithm (string name)
	Algorithm (string name, string config)
void	Initialize (void)
void	DeleteConfig (void)
void	DeleteSubstructure (void)
Registry *	ExtractLocalConfig (const Registry &in) const
Registry *	ExtractLowerConfig (const Registry &in, const string &alg_key) const
	Split an incoming configuration Registry into a block valid for the sub-algo identified by alg_key.
template<class T>
bool	GetParam (const RgKey &name, T &p, bool is_top_call=true) const
template<class T>
bool	GetParamDef (const RgKey &name, T &p, const T &def) const
template<class T>
int	GetParamVect (const std::string &comm_name, std::vector< T > &v, bool is_top_call=true) const
	Handle to load vectors of parameters.
int	GetParamVectKeys (const std::string &comm_name, std::vector< RgKey > &k, bool is_top_call=true) const
template<class T>
int	GetParamMat (const std::string &comm_name, TMatrixT< T > &mat, bool is_top_call=true) const
	Handle to load matrix of parameters.
template<class T>
int	GetParamMatSym (const std::string &comm_name, TMatrixTSym< T > &mat, bool is_top_call=true) const
int	GetParamMatKeys (const std::string &comm_name, std::vector< RgKey > &k, bool is_top_call=true) const
int	AddTopRegistry (Registry *rp, bool owns=true)
	add registry with top priority, also update ownership
int	AddLowRegistry (Registry *rp, bool owns=true)
	add registry with lowest priority, also update ownership
int	MergeTopRegistry (const Registry &r)
int	AddTopRegisties (const vector< Registry * > &rs, bool owns=false)
	Add registries with top priority, also udated Ownerships.
Protected Attributes inherited from genie::Algorithm
bool	fAllowReconfig
bool	fOwnsSubstruc
	true if it owns its substructure (sub-algs,...)
AlgId	fID
	algorithm name and configuration set
vector< Registry * >	fConfVect
vector< bool >	fOwnerships
	ownership for every registry in fConfVect
AlgStatus_t	fStatus
	algorithm execution status
AlgMap *	fOwnedSubAlgMp
	local pool for owned sub-algs (taken out of the factory pool)

Detailed Description

Computes corrected PDFs according to the Bodek-Yang model.

     Concrete implementation of the PDFModelI interface.

Author: Costas Andreopoulos <c.andreopoulos \at cern.ch> University of Liverpool

Created:\n September 29, 2004

License:\n Copyright (c) 2003-2025, The GENIE Collaboration: For the full text of the license visit http://copyright.genie-mc.org

Definition at line 27 of file BYPDF.h.

Constructor & Destructor Documentation

◆ BYPDF() [1/2]

BYPDF::BYPDF ( )

Definition at line 21 of file BYPDF.cxx.

             :
PDFModelI("genie::BYPDF")
{
 
}

References genie::PDFModelI::PDFModelI().

◆ BYPDF() [2/2]

BYPDF::BYPDF ( string config )

Definition at line 27 of file BYPDF.cxx.

                          :
PDFModelI("genie::BYPDF", config)
{
 
}

References genie::PDFModelI::PDFModelI().

◆ ~BYPDF()

BYPDF::~BYPDF ( )

virtual

Definition at line 33 of file BYPDF.cxx.

{
 
}

Member Function Documentation

◆ AllPDFs()

PDF_t BYPDF::AllPDFs	(	double	x,
		double	q2 ) const

virtual

Implements genie::PDFModelI.

Definition at line 83 of file BYPDF.cxx.

{
#ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
  LOG("BodekYang", pDEBUG)
       << "Inputs: x = " << x << ", |q2| = " << TMath::Abs(q2);
#endif
  if(TMath::Abs(q2) < fQ2min) q2=fQ2min;
 
  // get the uncorrected PDFs
  PDF_t uncorrected_pdfs = fBasePDFModel->AllPDFs(x, q2);
  double uv = uncorrected_pdfs.uval;
  double us = uncorrected_pdfs.usea;
  double dv = uncorrected_pdfs.dval;
  double ds = uncorrected_pdfs.dsea;
 
  // compute correction factor delta(d/u)
  double delta = this->DeltaDU(x);
#ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
  LOG("BodekYang", pDEBUG) << "delta(d/u) = " << delta;
#endif
 
  // compute u/(u+d) ratios for both valence & sea quarks
  double val = uv+dv;
  double sea = us+ds;
  double rv  = (val==0) ? 0. : uv/val;
  double rs  = (sea==0) ? 0. : us/sea;
 
#ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
  LOG("BodekYang", pDEBUG)
   << "valence[u/(u+d)] = " << rv << ", sea[u/(u+d)] = " << rs;
#endif
 
  // compute the corrected valence and sea quark PDFs:
  double uv_c =       uv        / ( 1 + delta*rv);
  double dv_c = (dv + uv*delta) / ( 1 + delta*rv);
  double us_c =       us        / ( 1 + delta*rs);
  double ds_c = (ds + us*delta) / ( 1 + delta*rs);
 
#ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
  LOG("BodekYang", pDEBUG) << "Bodek-Yang PDF correction:";
  LOG("BodekYang", pDEBUG) << "uv: " << uv << " --> " << uv_c;
  LOG("BodekYang", pDEBUG) << "dv: " << dv << " --> " << dv_c;
  LOG("BodekYang", pDEBUG) << "us: " << us << " --> " << us_c;
  LOG("BodekYang", pDEBUG) << "ds: " << ds << " --> " << ds_c;
#endif
 
  // fill in and return the corrected PDFs:
  PDF_t corrected_pdfs;
 
  corrected_pdfs.uval = uv_c;
  corrected_pdfs.dval = dv_c;
  corrected_pdfs.usea = us_c;
  corrected_pdfs.dsea = ds_c;
  corrected_pdfs.str  = uncorrected_pdfs.str;
  corrected_pdfs.chm  = uncorrected_pdfs.chm;
  corrected_pdfs.bot  = uncorrected_pdfs.bot;
  corrected_pdfs.top  = uncorrected_pdfs.top;
  corrected_pdfs.gl   = uncorrected_pdfs.gl;
 
  return corrected_pdfs;
}

References genie::EPDF::bot, genie::EPDF::chm, DeltaDU(), genie::EPDF::dsea, genie::EPDF::dval, fBasePDFModel, fQ2min, genie::EPDF::gl, LOG, pDEBUG, genie::EPDF::str, genie::EPDF::top, genie::EPDF::usea, and genie::EPDF::uval.

Referenced by Bottom(), Charm(), DownSea(), DownValence(), Gluon(), Strange(), Top(), UpSea(), and UpValence().

◆ Bottom()

double BYPDF::Bottom	(	double	x,
		double	q2 ) const

virtual

Implements genie::PDFModelI.

Definition at line 68 of file BYPDF.cxx.

{
  return AllPDFs(x,q2).bot;
}

References AllPDFs(), and genie::EPDF::bot.

◆ Charm()

double BYPDF::Charm	(	double	x,
		double	q2 ) const

virtual

Implements genie::PDFModelI.

Definition at line 63 of file BYPDF.cxx.

{
  return AllPDFs(x,q2).chm;
}

References AllPDFs(), and genie::EPDF::chm.

◆ Configure() [1/2]

void BYPDF::Configure ( const Registry & config )

virtual

overload the Algorithm::Configure() methods to load private data members from configuration options

Reimplemented from genie::Algorithm.

Definition at line 153 of file BYPDF.cxx.

{
  Algorithm::Configure(config);
  this->LoadConfig();
}

References genie::Algorithm::Configure(), and LoadConfig().

◆ Configure() [2/2]

void BYPDF::Configure ( string config )

virtual

Configure the algorithm from the AlgoConfigPool based on param_set string given in input An algorithm contains a vector of registries coming from different xml configuration files, which are loaded according a very precise prioriy This methods will load a number registries in order of priority: 1) "Tunable" parameter set from CommonParametes. This is loaded with the highest prioriry and it is designed to be used for tuning procedure Usage not expected from the user. 2) For every string defined in "CommonParame" the corresponding parameter set will be loaded from CommonParameter.xml 3) parameter set specified by the config string and defined in the xml file of the algorithm 4) if config is not "Default" also the Default parameter set from the same xml file will be loaded Effectively this avoids the repetion of a parameter when it is not changed in the requested configuration

Reimplemented from genie::Algorithm.

Definition at line 159 of file BYPDF.cxx.

{
  Algorithm::Configure(config);
  this->LoadConfig();
}

References genie::Algorithm::Configure(), and LoadConfig().

◆ DeltaDU()

double BYPDF::DeltaDU ( double x ) const

private

Definition at line 145 of file BYPDF.cxx.

{
// Computes the BY correction factor delta(d/u)
 
  double d = fX0 + fX1 * x + fX2 * TMath::Power(x,2);
  return d;
}

References fX0, fX1, and fX2.

Referenced by AllPDFs().

◆ DownSea()

double BYPDF::DownSea	(	double	x,
		double	q2 ) const

virtual

Implements genie::PDFModelI.

Definition at line 53 of file BYPDF.cxx.

{
  return AllPDFs(x,q2).dsea;
}

References AllPDFs(), and genie::EPDF::dsea.

◆ DownValence()

double BYPDF::DownValence	(	double	x,
		double	q2 ) const

virtual

Implements genie::PDFModelI.

Definition at line 43 of file BYPDF.cxx.

{
  return AllPDFs(x,q2).dval;
}

References AllPDFs(), and genie::EPDF::dval.

◆ Gluon()

double BYPDF::Gluon	(	double	x,
		double	q2 ) const

virtual

Implements genie::PDFModelI.

Definition at line 78 of file BYPDF.cxx.

{
  return AllPDFs(x,q2).gl;
}

References AllPDFs(), and genie::EPDF::gl.

◆ LoadConfig()

void BYPDF::LoadConfig ( void )

private

Definition at line 165 of file BYPDF.cxx.

{
 
  GetParam( "BY-X0", fX0 ) ;
  GetParam( "BY-X1", fX1 ) ;
  GetParam( "BY-X2", fX2 ) ;
 
  GetParam( "PDF-Q2min", fQ2min ) ;
 
  // get the base PDF model (typically GRV9* LO)
  fBasePDFModel =
    dynamic_cast<const PDFModelI *>(this->SubAlg("Uncorr-PDF-Set"));
}